<template>
    <div class="msite" >
      <!--首页头部-->
      <HeaderTop :title="address.name">
        <router-link to="/search" class="header_search" slot="left">
          <i class="iconfont icon-sousuo"></i>
        </router-link>
        <router-link :to="userInfo._id ? '/userInfo' : '/login'" class="header_login" slot="right">
          <span class="header_login_text" v-if="!userInfo._id">
            登录|注册
          </span>
          <span class="header_login_text" v-else>
            <i class="iconfont icon-person"></i>
          </span>
        </router-link>
      </HeaderTop>
      <!--首页导航-->
      <nav class="msite_nav">
        <div class="swiper-container" v-if="categorys.length">
          <div class="swiper-wrapper">
            <div class="swiper-slide" v-for="(categorys,index) in categorysArr" :key="index">
              <a href="javascript:" class="link_to_food" v-for="(category,index) in categorys" :key="index">
                <div class="food_container">
                  <img :src="baseImageUrl+category.image_url">
                </div>
                <span>{{category.title}}</span>
              </a>
            </div>
          </div>
          <!-- Add Pagination -->
          <div class="swiper-pagination"></div>
        </div>
        <img src="./images/msite_back.svg" alt="back" v-else>
      </nav>
      <!--首页附近商家-->
      <div class="msite_shop_list">
        <div class="shop_header">
          <i class="iconfont icon-xuanxiang"></i>
          <span class="shop_header_title">附近商家</span>
        </div>
        <ShopList></ShopList>
      </div>
    </div>
</template>

<script>
import { mapState } from 'vuex'

import HeaderTop from '../../components/HeaderTop/HeaderTop'
import ShopList from '../../components/ShopList/ShopList'
import Swiper from 'swiper'
import 'swiper/css/swiper.css'

export default {
  name: 'FooterGuide',
  components: {
    HeaderTop,
    ShopList
  },
  data () {
    return {
      baseImageUrl: 'http://fuss10.elemecdn.com'
    }
  },
  mounted () {
    this.$store.dispatch('getCategorys')
  },
  watch: {
    categorys (val) { // categorys有数据 在异步更新界面之前执行
      // 完成界面更新立即创建swiper对象
      this.$nextTick(() => {
        // 创建一个swiper实例对象 来实现轮播
        return new Swiper('.swiper-container', {
          look: true, // 循环轮播
          // 如果需要分页器
          pagination: {
            el: '.swiper-pagination'
          }
        })
      })
    }
  },
  computed: {
    ...mapState(['address', 'categorys', 'userInfo']),
    // 根据categorys一维数组 生成二维数组 小数组的远古三最大是8
    categorysArr () {
      const {categorys} = this
      // 准备空的2维数组
      const arr = []
      let minArr = []
      // 遍历category
      categorys.forEach(c => {
        // 如果当前小数组已经满了 创建一个新的
        if (minArr.length === 8) {
          minArr = []
        }
        // 如果minarr是空的 将小数组保存到大数组中
        if (minArr.length === 0) {
          arr.push(minArr)
        }
        minArr.push(c)
      })
      return arr
    }
  }
}
</script>

<style lang="stylus">
  @import "../../common/stylus/mixins.styl"
  .msite  //首页
    width 100%
    .msite_nav
      bottom-border-1px(#e4e4e4)
      margin-top 45px
      height 200px
      background #fff
      .swiper-container
        width 100%
        height 100%
        .swiper-wrapper
          width 100%
          height 100%
          .swiper-slide
            display flex
            justify-content center
            align-items flex-start
            flex-wrap wrap
            .link_to_food
              width 25%
              .food_container
                display block
                width 100%
                text-align center
                padding-bottom 10px
                font-size 0
                img
                  display inline-block
                  width 50px
                  height 50px
              span
                display block
                width 100%
                text-align center
                font-size 13px
                color #666
        .swiper-pagination
          >span.swiper-pagination-bullet-active
            background #02a774
    .msite_shop_list
      top-border-1px(#e4e4e4)
      margin-top 10px
      background #fff
      .shop_header
        padding 10px 10px 0
        .shop_icon
          margin-left 5px
          color #999
        .shop_header_title
          color #999
          font-size 14px
          line-height 20px
</style>
